Examples:
A fighter is fighting a dragon. The dragon uses its Frightful Presence action. The fighter, who has a Wisdom score of 15, succeeds on the DC 16 Wisdom saving throw. It is then the party warlock's turn, and she decides to polymorph the fighter into a giant hairy ape with a Wisdom score of 12.
Alternately: The same fighter is fighting another dragon. This time he fails the save against its Frightful Presence, and is frightened for 1 minute. During that minute, the cleric casts a spell to increase the fighter's Wisdom score to 17.
In either example, will the fighter now need to make another DC 16 Wisdom save, since his Wisdom score has changed?
The following questions were similar, but did not answer mine: